JPH0747217B2 - Multi-electrode submerged arc welding method - Google Patents
Multi-electrode submerged arc welding methodInfo
- Publication number
- JPH0747217B2 JPH0747217B2 JP1232473A JP23247389A JPH0747217B2 JP H0747217 B2 JPH0747217 B2 JP H0747217B2 JP 1232473 A JP1232473 A JP 1232473A JP 23247389 A JP23247389 A JP 23247389A JP H0747217 B2 JPH0747217 B2 JP H0747217B2
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- welding
- electrode
- weaving
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Arc Welding In General (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は多電極サブマージアーク溶接法、特に５電極以
上の１プール多電極サブマージアーク溶接法に関する。TECHNICAL FIELD The present invention relates to a multi-electrode submerged arc welding method, and more particularly to a one-pool multi-electrode submerged arc welding method with five or more electrodes.
サブマージアーク溶接において、多電極化を図ればその
電極数に応じて溶接速度が向上することは、良く知られ
た事実である。例えば「鉄と鋼」第71年（1985）第３号
によると、製管溶接の分野では、１プール４電極サブマ
ージアーク溶接法が一般的であり、１プール４電極サブ
マージアーク溶接法は１プール３電極サブマージアーク
溶接法に比較して30％の増速が達成されるとされてい
る。In submerged arc welding, it is a well known fact that if multiple electrodes are used, the welding speed is improved according to the number of electrodes. For example, according to "Iron and Steel" No. 3 (1985) No. 71, 1 pool 4 electrode submerged arc welding is common in the field of pipe welding, and 1 pool 4 electrode submerged arc welding is 1 pool. It is said that a 30% speedup can be achieved compared to the three-electrode submerged arc welding method.
ところが、５電極以上の１プール多電極サブマージアー
ク溶接の場合は、電極の増加により充分な量の溶着金属
は確保されるが、電極数に見合う溶接速度を確保するこ
とは困難である。However, in the case of one-pool multi-electrode submerged arc welding with 5 or more electrodes, a sufficient amount of deposited metal can be secured by increasing the number of electrodes, but it is difficult to secure a welding speed commensurate with the number of electrodes.
すなわち、５電極以上の１プール多電極サブマージアー
ク溶接で電極数に見合う溶接速度を確保しようとする
と、第１図（ａ）〜（ｃ）に示すように、母材1,1の開
先２の部分に形成された溶接池３が溶接線方向に長く延
びてしまう。その結果、溶接ビード４の中央部にひけ巣
状の欠陥５が発生するとか、溶接ビード４の側方にアン
ダーカット６が発生するといった問題が生じ、健全な溶
接部を得るのが困難になるのである。That is, when trying to secure a welding speed commensurate with the number of electrodes in one-pool multi-electrode submerged arc welding with five or more electrodes, as shown in FIGS. The weld pond 3 formed in the portion of this extends long in the welding line direction. As a result, there are problems such as a shrinkage cavity-like defect 5 occurring in the center of the weld bead 4 and an undercut 6 occurring laterally of the weld bead 4, making it difficult to obtain a sound weld. Of.
なお、サブマージアーク溶接の多電極化に伴う上記問題
は、特願昭62−21159号にて提案されたような溶接材料
の改善のみでは、完全に解決することは不可能である。
つまり、前記アンダーカット等の欠陥は溶接材料の影響
よりむしろ溶接電極の動作に大きく影響するからであ
る。The above problems associated with the multi-electrodes of submerged arc welding cannot be completely solved only by improving the welding material as proposed in Japanese Patent Application No. 62-21159.
That is, the defects such as the undercut have a great influence on the operation of the welding electrode rather than the influence of the welding material.
本発明は斯かる事情に鑑みなされたものであり、その目
的は多電極化に伴う溶接欠陥の発生を抑え、５電極以上
の場合にその電極数に見合う溶接速度を確保できる多電
極サブマージアーク溶接法を提供することにある。The present invention has been made in view of such circumstances, and an object thereof is multi-electrode submerged arc welding capable of suppressing the occurrence of welding defects due to the increase in the number of electrodes and ensuring a welding speed commensurate with the number of electrodes when the number of electrodes is 5 or more. To provide the law.
本発明の多電極サブマージアーク溶接法は、５電極以上
の１プール多電極サブマージアーク溶接法において、少
なくとも最終電極を溶接単位長さ当り0.1〜10回/cm、電
極径の２〜５倍の幅でウィービングさせることを特徴と
してなる。The multi-electrode submerged arc welding method of the present invention is a 1-pool multi-electrode submerged arc welding method of five or more electrodes, in which at least the final electrode is 0.1 to 10 times / cm per welding unit length, and the width is 2 to 5 times the electrode diameter. It is characterized by weaving in.
１プール多電極サブマージアーク溶接法において、少な
くとも最終電極をウィービングさせることにより、溶接
ビード中央部における最終凝固幅が広がり、第１図
（ｂ）に示したひけ巣状の欠陥５が防止される。また、
溶湯が溶接進行方向に直角な方向に押しやられ、溶湯と
母材とのなじみが良くなるので、ビード幅が広がり、第
１図（ｃ）に示したアンダーカット６等の欠陥も防止さ
れる。In the one-pool multi-electrode submerged arc welding method, by weaving at least the final electrode, the final solidification width in the central portion of the weld bead is widened and the shrinkage cavity-like defect 5 shown in FIG. 1 (b) is prevented. Also,
The molten metal is pushed in a direction perpendicular to the welding proceeding direction, and the compatibility between the molten metal and the base material is improved, so that the bead width is widened and defects such as the undercut 6 shown in FIG. 1 (c) are prevented.
本発明法においては、こうして１プール多電極サブマー
ジアーク溶接における高速化阻害要因が取り除かれるこ
とにより、５電極以上の場合にその電極数に見合う溶接
速度の大幅向上が実現される。なぜなら、ウィービング
による増速効果が５電極以上で特に顕著であるからであ
る。In the method of the present invention, the factor that impedes the speedup in the one-pool multi-electrode submerged arc welding is removed in this way, so that when the number of electrodes is 5 or more, the welding speed corresponding to the number of electrodes is significantly improved. This is because the speed-up effect due to weaving is particularly remarkable at 5 or more electrodes.
本発明法においては、上記効果を得るために最終電極を
ウィービングさせることが必須である。他の電極をウィ
ービングさせることも可能であるが、他の電極だけの場
合は、溶け込み深さが減少してしまい、溶け込み深さを
確保するために溶接速度を減じる必要があり、本発明の
目的と反する結果となる。従って、他の電極をウィービ
ングさせる場合は、最終電極をウィービングさせるとと
もに前記最終電極に隣接した電極をウィービングさせる
のが望ましい。In the method of the present invention, it is essential to weave the final electrode in order to obtain the above effects. It is also possible to weave other electrodes, but in the case of only other electrodes, the penetration depth will decrease, and it is necessary to reduce the welding speed in order to secure the penetration depth. The result will be contrary to. Therefore, when weaving another electrode, it is desirable to weave the final electrode and also the electrode adjacent to the final electrode.
ウィービングの回数は溶接速度に応じて適正値が存在
し、溶接単位長さ当りの回数で表わして0.1〜10回/cmの
範囲とする。ウィービングの回数が0.1回/cm未満では溶
接ビードが蛇行したような形状になり、アンダーカット
に対する防止効果が不充分になる。逆にウィービングの
回数が10回/cmを超えると、アークの乱れが顕著にな
り、溶接ビードの外観が悪化する。There is an appropriate value for the number of weavings depending on the welding speed, and it is expressed as the number of times per welding unit length and is in the range of 0.1 to 10 times / cm. If the weaving frequency is less than 0.1 times / cm, the welding bead will have a meandering shape and the effect of preventing undercut will be insufficient. On the contrary, when the number of weaving exceeds 10 times / cm, the arc disturbance becomes remarkable and the appearance of the weld bead is deteriorated.
ウィービング幅については、これが電極径の２倍未満で
はウィービングによる効果が不充分になり、電極径の５
倍を超えると溶け込み形状が不良になる。従って、ウィ
ービング幅は電極径の２倍〜５倍の範囲とする。Regarding the weaving width, if the weaving width is less than twice the electrode diameter, the effect of weaving becomes insufficient, and the weaving width is 5 times the electrode diameter.
If it exceeds 2 times, the melted shape will be poor. Therefore, the weaving width is in the range of 2 to 5 times the electrode diameter.
電極数は５以上とする。４電極以下ではウィービングを
行わなくても電極数の増加に見合う増速効果が得られ、
またウィービングを行ったことによる増速効果も小さい
からである。The number of electrodes is 5 or more. With 4 electrodes or less, the speed-up effect corresponding to the increase in the number of electrodes can be obtained without weaving,
Also, the speed-up effect due to the weaving is small.
以下に本発明の実施例を従来例と対比させて説明する。 An example of the present invention will be described below in comparison with a conventional example.
SM50Aよりなる板厚19mmの供試材に深さ7.5mmの90゜Ｖ開
先を形成して、同材料を２〜６電極の１プール多電極サ
ブマージアーク溶接によりウィービング条件を変えて溶
接した。溶接材料は全て同じものを使用し、ワイヤは直
径4.0mmのソリッドワイヤ、フラックスは高塩基性溶融
型フラックスとした。各溶接における条件を第１表に示
し、溶接結果を第２表に示す。また、電極数およびウィ
ービングが溶接速度に及ぼした影響を第３表に整理して
示す。A 90 mm V groove with a depth of 7.5 mm was formed on a test material of SM50A having a plate thickness of 19 mm, and the same material was welded by one pool multi-electrode submerged arc welding with 2 to 6 electrodes under different weaving conditions. The same welding material was used, the wire was a solid wire with a diameter of 4.0 mm, and the flux was a highly basic molten type flux. The conditions in each welding are shown in Table 1, and the welding results are shown in Table 2. Table 3 shows the effects of the number of electrodes and weaving on the welding speed.
溶接結果はひけ巣状欠陥、アンダーカット、スラグ巻き
込み、ビード外観、作業性の５種類について示してお
り、ひけ巣状欠陥は磁粉探傷により調査した溶接1m当た
りの欠陥長さで評価し、アンダーカットおよびビード外
観は目視による評価とした。また、スラグ巻き込みはＸ
線により調査した溶接1m当たりの欠陥個数により評価し
た。Welding results are shown for five types: sinkhole defect, undercut, slag entrapment, bead appearance, and workability. The sinkhole defect is evaluated by the defect length per 1 m of welding investigated by magnetic particle flaw detection, and undercut The appearance of the beads was evaluated visually. Also, the slag involvement is X
It was evaluated by the number of defects per 1 m of welding investigated by lines.
なお、溶接電流、溶接電圧は溶け込み深さが一定になる
ように調整しており、電源はNo.12のみ全電極交流と
し、それ以外は第１電極直流、他の電極交流とした。The welding current and welding voltage were adjusted so that the penetration depth was constant, and the power source was AC for all electrodes only for No. 12, and the other electrodes were AC for the first electrode and other electrodes.
No.1,3〜６は電極数６で第６電極をウィービングさせた
例、No.2は電極数６で第5,6電極をウィービングさせた
例、No.7は電極数６でウィービングを行わなかった例で
ある。いずれの例も溶接速度は3.5m/minとした。 No. 1, 3 to 6 are examples of weaving the 6th electrode with 6 electrodes, No. 2 are examples of weaving the 5th and 6th electrodes with 6 electrodes, and No. 7 are weaving with 6 electrodes. This is an example not performed. In all cases, the welding speed was 3.5 m / min.
本発明例であるNo.1,2では溶接欠陥が皆無である。しか
し、No.3〜６ではウィービング条件が不適なため、若干
の溶接欠陥が認められる。ウィービング不実施のNo.7で
は溶接欠陥が顕著である。Nos. 1 and 2 which are examples of the present invention have no welding defects. However, in Nos. 3 to 6, since the weaving conditions are not suitable, some welding defects are recognized. Welding defects are prominent in No. 7 without weaving.
No.8は電極数６でウィービングを行わない場合に溶接欠
陥の生じない領域まで溶接速度を低下させた比較例であ
るが、15％の速度低下を余儀なくされている。No. 8 is a comparative example in which the welding speed was reduced to a region where no welding defect occurred when weaving was not performed with the number of electrodes being 6, but a 15% reduction in speed was inevitable.
No.9は電極数５で第５電極をウィービングさせた本発明
例であり、No.10は電極数５でウィービングを行わなか
った比較例である。いずれの例も溶接速度は2.9m/minと
した。本発明例では2.9m/minの速度で溶接欠陥は皆無で
ある。これに対して、ウィービングなしの比較例では溶
接欠陥が多発している。No. 9 is an example of the present invention in which the fifth electrode was weaved with 5 electrodes, and No. 10 is a comparative example with 5 electrodes and no weaving was performed. In all cases, the welding speed was 2.9 m / min. In the example of the present invention, there is no welding defect at a speed of 2.9 m / min. On the other hand, in the comparative example without weaving, welding defects frequently occurred.
No.11はウィービングなしの場合に溶接欠陥の生じない
領域まで溶接速度を低下させた比較例であるが、17％の
速度低下を余儀なくされている。No. 11 is a comparative example in which the welding speed was reduced to a region where no welding defect was generated without weaving, but the speed was reduced by 17%.
No.12,13は電極数４で第４電極をウィービングさせた比
較例、No.14は電極数４でウィービングを行わなかった
従来例である。いずれの例も溶接速度は2.3m/minとし
た。また、No.15は電極数４でウィービングを行わない
場合に溶接欠陥の生じない領域まで溶接速度を低下させ
た従来例である。ウィービングによる増速率は５％であ
る。Nos. 12 and 13 are comparative examples in which the fourth electrode is weaved with 4 electrodes, and No. 14 is a conventional example in which weaving is not performed with 4 electrodes. In all cases, the welding speed was 2.3 m / min. No. 15 is a conventional example in which the welding speed is reduced to a region where no welding defect occurs when weaving is not performed with four electrodes. The rate of speed increase by weaving is 5%.
No.16〜18および19〜21は３電極および２電極の場合で
あるが、この場合もウィービングによる増速率は数％で
ある。Nos. 16 to 18 and 19 to 21 are cases of three electrodes and two electrodes, and in this case as well, the speedup rate by weaving is several%.
以上を総合すると、ウィービングを行わない従来例の場
合、溶接速度は２電極で1.3m/min、３電極で、1.7m/mi
n、４電極で2.2m/minが限界になり、１電極増加の毎に
限界溶接速度は約30％増加している。しかし、５電極で
の限界溶接速度は2.5m/min、６電極でも限界溶接速度は
3.0m/minに過ぎず、５電極以上では電極増加に見合う増
速効果は得られていない。ここでウィービングを行う
と、２〜４電極の場合は数％の増速効果が得られるだけ
であるが、５電極および６電極では10数％の増速効果が
得られ、その結果、従来の４電極に比べて５電極では約
30％、６電極では約60％の高速化がそれぞれ図れ、５電
極以上で電極の増加に見合う増速効果が得られる。Summarizing the above, in the case of the conventional example without weaving, the welding speed was 1.3 m / min for 2 electrodes and 1.7 m / mi for 3 electrodes.
The limit is 2.2 m / min for 4 electrodes, and the limit welding speed increases by about 30% with each increase of 1 electrode. However, the maximum welding speed for 5 electrodes is 2.5 m / min, and the maximum welding speed for 6 electrodes is
It is only 3.0 m / min, and the speed-up effect commensurate with the increase in the number of electrodes is not obtained with five or more electrodes. When weaving is performed here, the speed-up effect of only several% is obtained in the case of 2 to 4 electrodes, but the speed-up effect of 10% or more is obtained in the case of 5 electrodes and 6 electrodes. About 5 electrodes compared to 4 electrodes
With 30% and 6 electrodes, approximately 60% speedup can be achieved, and with 5 or more electrodes, a speedup effect commensurate with the increase in electrodes can be obtained.
以上の説明から明らかなように、本発明の多電極サブマ
ージアーク溶接法は、高速化阻害要因である溶接欠陥の
発生を抑えることにより、溶接速度の向上に寄与し、こ
れまで電極数の増加に見合う増速効果が得られることが
できなかった５電極以上で電極数の増加に見合う顕著な
増速効果をもたらすものである。As is clear from the above description, the multi-electrode submerged arc welding method of the present invention contributes to the improvement of the welding speed by suppressing the occurrence of welding defects, which is a speed-up inhibiting factor, and thus increases the number of electrodes so far. When the number of electrodes is 5 or more, the corresponding speed-up effect cannot be obtained, and a remarkable speed-up effect corresponding to the increase in the number of electrodes is brought about.
第１図（ａ）〜（ｃ）は溶接欠陥の説明図で、（ａ）は
平面図、（ｂ）は（ａ）のＸ−Ｘ線断面矢視図、（ｃ）
は（ａ）のＹ−Ｙ線断面矢視図である。 4:溶接ビード、5:ひけ巣状の欠陥、6:アンダーカット。1 (a) to 1 (c) are explanatory views of welding defects, (a) is a plan view, (b) is a cross-sectional view taken along the line X-X of (a), (c).
FIG. 7A is a sectional view taken along the line Y-Y of FIG. 4: Weld beads, 5: Defects in the shape of cavities, 6: Undercut.
Claims (1)
ーク溶接法において、少なくとも最終電極を溶接単位長
さ当り0.1〜10回/cm、電極径の２〜５倍の幅でウィービ
ングさせることを特徴とする多電極サブマージアーク溶
接法。1. A 1-pool multi-electrode submerged arc welding method with 5 or more electrodes, wherein at least the final electrode is weaved with a width of 0.1 to 10 times / cm per welding unit length and 2 to 5 times the electrode diameter. Multi-electrode submerged arc welding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1232473A JPH0747217B2 (en) | 1989-09-06 | 1989-09-06 | Multi-electrode submerged arc welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1232473A JPH0747217B2 (en) | 1989-09-06 | 1989-09-06 | Multi-electrode submerged arc welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0394980A JPH0394980A (en) | 1991-04-19 |
| JPH0747217B2 true JPH0747217B2 (en) | 1995-05-24 |
Family
ID=16939851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1232473A Expired - Lifetime JPH0747217B2 (en) | 1989-09-06 | 1989-09-06 | Multi-electrode submerged arc welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0747217B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5402824B2 (en) * | 2010-05-13 | 2014-01-29 | 新日鐵住金株式会社 | Multi-electrode submerged arc welding method with excellent weldability |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59107775A (en) * | 1982-12-10 | 1984-06-22 | Nippon Kokan Kk <Nkk> | Four-electrode submerged arc welding method |
| JPS61286072A (en) * | 1985-06-13 | 1986-12-16 | Nippon Kokan Kk <Nkk> | Large interpole one face oscillating submerged arc welding method |
-
1989
- 1989-09-06 JP JP1232473A patent/JPH0747217B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0394980A (en) | 1991-04-19 |
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